I
have mounted the Eberspacher unit in a
purpose built aluminium box. Normally you find this type of heater in articulated truck
cabs for keeping the driver warm at night without running the truck's engine. They are
ideal for campers, as they throw out up to 1800 watts of heat (bigger ones are also
available), yet use very little diesel.

By mounting the heater in such a manner, i.e. with the air inlet on
the outside of the living space, it ensures that clean / fresh air is heated, rather than
recirculating "stale" air.

Before anyone sends me an email to tell me this: I am aware that I
need to duct the exhaust gases well away from the air inlet, for obvious reasons. I have a
long exhaust pipe ready to fit (not shown in this photo) which will carry the exhaust
gases to the other side of the truck.